Php/docs/parle.regex.chars
From Get docs
Character representations
| Sequence | Description |
|---|---|
| \a | Alert (bell). |
| \b | Backspace. |
| \e | ESC character, \x1b. |
| \n | Newline. |
| \r | Carriage return. |
| \f | Form feed, \x0c. |
| \t | Horizontal tab, \x09. |
| \v | Vertical tab, \x0b. |
| \oct | Character specified by a three-digit octal code. |
| \xhex | Character specified by a hex code. |
| \cchar | Named control character. |
